The Israel Defense Forces on Saturday released footage of an air strike the previous evening on a group Gaza militants who were launching a rocket into Israel.

The Palestinian militants were all killed in the air strike, which took place east of Gaza City.

The IDF said in a statement that the men belonged to the Palestinian militant group Islamic Jihad. It also said they had been part of cell that had fired Qassam rockets into Israel over the past few weeks, including the cross-border attack on the recent Jewish holiday of Rosh Hashanah.

The IDF identified the men as Mahmoud Mussah Rammadan Bana, Kamel Hamdan Ibrahim Dahduh and Mohamed Salem Barawi Marshoud.

In the statement, the army warned that it would "respond harshly to any attempt to break the calm in Israel's southern communities."

Following IAF strike, Jihad vows to 'teach Israel a lesson'

Following the air strike, Islamic Jihad vowed to exact revenge and "teach Israel a lesson," Army Radio reported.

The Palestinian news agency Ma'an reported that the three men were affiliated with Islamic Jihad's armed wing, the Al-Quds Brigades, and that one of the dead militants was the son of slain Al-Quds leader Khaled Dahduh.

Gaza militants fired a Qassam rocket and several mortar shells into Israel following the air strike, but caused no injuries or damage.

Hamas spokesperson Fawzi Barhoum said Friday that "it isn't strange that Israel continues to attack, what is strange is that the Palestinian Authority continues to attend summits in New York with the Israeli occupation."

The Al-Quds Brigade issued a statement warning of its imminent revenge, saying that the "Zionist enemy will suffer serious retaliation."